Missing Water Seed

Go to the Water Palace and speak with Luka to find out that the water seed has been stolen. She'll also let you know that the waterways have let her know it's at Gaea's Navel, so head back there.

When you get there, make sure to upgrade your weapons with your new orbs from the ruins and Pandora's castle, and stop by the inn to recover your magic. In the entrance area to the village you'll find the elder and Jema, as well as a giant hole. They say the thieves are in there. Go inside to find yourself on a large underground ship. Head down the stairs and open the treasure chest for a whip's orb, then head into the next room.

Here you'll find the culprits, the Scorpion Army. (Though there are only 3 of them...) They say they stole the seed to power a weapon of theirs and you're going to have to fight it. Go up into one more room to find Killroy, their weapon. It overloads with the power from the seed, so they switch to auxiliary power, and you have to fight it.

BOSS - KILROY

Killroy isn't a very difficult boss at all as long as you know to step back after attacking. Wait for him to swing his hammer, hit him, step back, repeat. He doesn't have any magic attacks, but he can knock your characters unconcious, and turn them into Moogles. (Which sounds cool, but it's not. Lowered defense, no attacking or magic. -_-) If you keep your distance though, he won't do much. He does hit hard if he connects, so you'll have to heal some with Primm's magic. If you want to, use whatever spells you have at a higher level with Popoi to squeeze some extra damage out from a safe distance. When you take Killroy down you get a javelin's orb, the mana seed, and the Scorpion Army runs away.

Jema apparently left with some soldiers from Pandora, and you need to go back to the water palace with the seed. Head to the inn once more for magic recovery, get your weapons upgraded again, and go back to the water palace ONE more time.

Upon arriving you'll find there are some of the monsters from the cave that Undine was in right in front of the palace. When you go inside, there are more. Kill them and head back to the atlar to find Ghestar, one of the empire's generals. He traps you, breaks the seal on the water seed, and leaves you to fight his pet, Jabberwocky.

BOSS - JABBERWOCKY

Jabberwocky is another fairly easy boss. He can cast poison cloud on your party and occasionally his attacks will knock you down, but he doesn't hit very hard, and doesn't move all that much. Just keep hitting his heads with your best weapon, and if Popoi has magic, use either Freeze or Diamond Missile, whichever is a higher level. Just heal if anyone gets below 50 hp or so and he'll go down really easily. He gives you a bow's orb when defeated.

Return the seed to the altar and you get it's power again. Jema is here as well, speak to him to get a whip's orb that he found somewhere. <_< Luka also tells you you need to visit all the palaces around the world to get the mana seeds power, and to visit a sage Joch in the lofty mountains, he will help you as well. Jema also tells you that the next place to go is the Upper Land, and that you can get there by talking to the cannon travel man by Potos village, so we'll be going there next.

OPTIONAL

If you would like, head back to Gaea's Navel one last time before going to the Upper Land, and speak to the elder. He'll give you the Midge Mallet, which can shrink or unshrink you. It's not that critical since Remedy is 1mp, but it doesn't have the cast time and if you're low on mana it can help.